CRL's 12' (3.66 m) Low Profile Rolling Track Assemblies are packaged to contain the Extrusions, Wheels, and Guides you will need to complete your custom project. Designed for 1/4" (6 mm) tempered glass doors, these Track Assemblies have long been a popular choice for display cases, trophy cases, china cabinets, as well as cases for any retail store application. Choose from either Nylon or Steel Ball Bearing Wheel Assemblies for years of smooth and reliable service. The versatility of this track system allows for design flexibility. Optional locking hardware is available. For dry glazing with 1/4" (6 mm) glass use Cat. No. GC728C Vinyl (sold separately).